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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '000656ff028c5fae7d115d8848f6174c5000e418a4027e6ff4d22adc93c9c260' 
  AND token = 'CI1UW23n7l+VNarV04boOMBKjlDfh4ytTbaiKJH77MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}